| 各向同性土与横观各向同性土的力学特性和持水特性 |
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| 引用本文： | 郭楠,陈正汉,杨校辉,郭剑峰,孙树国.各向同性土与横观各向同性土的力学特性和持水特性[J].西南交通大学学报,2019,54(6):1235-1243. |
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| 作者姓名： | 郭楠 陈正汉 杨校辉 郭剑峰 孙树国 |
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| 基金项目： | 国家自然科学基金资助项目（11672330；51379220）；陕西省科技统筹创新工程计划资助项目（2014KTDZ03-01） |
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| 摘 要： | 为了探讨不同初始状态下非饱和黄土的力学性质和水量变化规律之间的差异，提出了制备各向同性及横观各向同性试样的方法，用改进的非饱和土三轴仪对制备的各向同性、横观各向同性及常规重塑试样进行了72个三轴固结排水剪切试验. 试验结果表明:对不同削样角度的各向同性试样进行试验验证，发现其近似各向同性；3种不同初始状态下各向同性非饱和试样的破坏应力最大，横观各向同性非饱和试样次之；横观各向同性试样在剪切阶段的初始切线模量最大，其他两组试样的初始切线模量较小且近似相等；各向同性试样及横观各向同性试样在剪切的初始阶段均有轻微的剪胀现象，常规重塑试样均处于剪缩状态；不同初始状态下的各非饱和试样在剪切阶段吸力变化对排水的影响并不显著，其中横观各向同性试样的偏应力-含水率关系曲线的斜率绝对值最小，其他两组试验的斜率几乎相同，各向同性、横观各向同性及常规的重塑试样的力学特性及持水特性不尽相同. 本文的研究成果可为不同初始状态下各模型的建立及工程应用提供有益的参考.
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| 关 键 词： | 各向同性土 横观各向同性 预固结 非饱和黄土 力学特性 |
| 收稿时间： | 2018-01-20 |
Mechanical Properties and Water Holding Characteristics of Initially Isotropic Soils and Transversely Isotropic Soils |
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| GUO Nan,CHEN Zhenghan,YANG Xiaohui,GUO Jianfeng,SUN Shuguo.Mechanical Properties and Water Holding Characteristics of Initially Isotropic Soils and Transversely Isotropic Soils[J].Journal of Southwest Jiaotong University,2019,54(6):1235-1243. |
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| Authors: | GUO Nan CHEN Zhenghan YANG Xiaohui GUO Jianfeng SUN Shuguo |
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| Abstract: | In order to investigate the difference between the mechanical properties and water quantity variation of unsaturated loess under different initial conditions, a method for preparing isotropic and transversely isotropic specimens was suggested. An improved triaxial apparatus for unsaturated soils was used to carry out 72 consolidated drained triaxial tests on prepared isotropic, transversely isotropic and regular specimens. Isotropic samples with different cutting angles were studied experimentally and found to be approximately isotropic. For three different initial states, the failure stress of the isotropic unsaturated specimen is the largest, followed by that of the transversely isotropic unsaturated specimen; the initial tangent modulus of the transversely isotropic specimen is the largest at the shear stage, while those of the other two groups are smaller and approximately equal. Both the isotropic and transversely isotropic specimens have slight dilatancy at the initial stage of shear, while all ordinary remoulded specimens are in the state of shear contraction. Under different initial conditions, the change of the suction of unsaturated samples has little effect on the drainage, the absolute slope value of the deviator stress-water content curve of the transversely isotropic sample is the lowest, and those of the other two groups are almost the same. The mechanical properties and water holding characteristics of the isotropic, transversely isotropic and ordinary remoulded specimens are different. The research results obtained may provide a useful reference for the establishment of different models of soil under different initial conditions and for various engineering applications. |
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